Need details on de-watering methods without mechanical means and electrical energy

Hello,

Massive structures are being constructed in remote areas viz., pump houses ,etc. There is no electricity in the vicinity. They need foundation upto 20-25 metres depth from ground level. It is becoming extremely difficult to lay foundations at such depth with seepage water pooling up from time to time. Though de-watering is done through mechanical means with generators, sometimes it is becoming impossible and the time consumed for this is also high. 

Are there alternate cost effective methods for separation of Hydrogen and oxygen from Water (H2O)? Is there any vegetable oil that can initiate the evaporation at a faster rate when compared to inflow rate?

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